Over the last few months, wily spammers may have figured out how to crack the security feature known as "captchas." With an army of compromised Windows PCs known as botnets, they've been using their new power to flood Google's Blogger with spam. Why Blogger?

Likely because of the rumored privilege afforded to it by Google's search algorithm. Blogger blogs appear on the blogspot.com domain, which has high rank in search results, and Google makes it easy to run profitable AdSense text links on the site. That adds up to easy money.Researchers aren't clear if spammers have managed to compromise captchas through automation or simply by employing cheap labor, but if the latter, then even KittenAuth won't be able to stem the tide of spam blogs gaming keywords for clickfraud riches. Your move, Google.